This preview shows page 1. Sign up to view the full content.
Unformatted text preview: It is best to wave the flame under the crucible and to keep the cover partially open The rate of heating much be gentle enough to prevent the acid from boiling and splattering the mixture When a dry solid appears, heat the crucible in the full flame of the Bunsen burner for 10 minutes Allow to cool for 15 minutes Weight the crucible, cover, and residue and record mass To ensure that all volatile substances have evaporated, reheat the crucible, cover, and residue for 5 minutes All to cool for 15 minutes and reweigh If the change of mass is more than .001g, repeat, cool and weigh. Use this constant mass to calculate the percent composition of the mixture. Duplicate run? Perform calculations...
View Full Document
This note was uploaded on 04/18/2008 for the course CHE 101 taught by Professor Churchhill during the Fall '08 term at SUNY Buffalo.
- Fall '08